hf mf sim x reader attack add-ons

[proxmark3-svn] / client / nonce2key / nonce2key.c

diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index 23a948a8872ff5f2c38bd500582d1c36f8ee0829..9abc814be807ce6164da6130f77fd8d75e464efd 100644 (file)
--- a/client/nonce2key/nonce2key.c
+++ b/client/nonce2key/nonce2key.c
@@ -38,7 +38,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
   static int64_t *last_keylist;
   rr = 0;
   
-  if (last_uid != uid)
+  if (last_uid != uid && last_keylist != NULL)
   {
        free(last_keylist);
        last_keylist = NULL;
@@ -48,7 +48,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
   // Reset the last three significant bits of the reader nonce
   nr &= 0xffffff1f;
   
-  PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx")\n\n",uid,nt,par_info,ks_info);
+  PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n\n",uid,nt,par_info,ks_info,nr);
 
   for (pos=0; pos<8; pos++)
   {
@@ -125,7 +125,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
        }
        
        printf("key_count:%d\n", key_count);
-       
+
        // The list may still contain several key candidates. Test each of them with mfCheckKeys
        for (i = 0; i < key_count; i++) {
                uint8_t keyBlock[6];
@@ -133,7 +133,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
                key64 = *(last_keylist + i);
                num_to_bytes(key64, 6, keyBlock);
                key64 = 0;
-               if (!mfCheckKeys(0, 0, 1, keyBlock, &key64)) {
+               if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
                        *key = key64;
                        free(last_keylist);
                        last_keylist = NULL;
@@ -149,3 +149,45 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
        
        return 1;
 }
+
+// 32 bit recover key from 2 nonces
+uint64_t mfkey32(uint32_t uid, uint32_t nt, uint32_t nr0_enc, uint32_t ar0_enc, uint32_t nr1_enc, uint32_t ar1_enc) {
+       struct Crypto1State *s,*t;
+       uint64_t key=0;     // recovered key
+       /*uint32_t uid;     // serial number
+       uint32_t nt;      // tag challenge
+       uint32_t nr0_enc; // first encrypted reader challenge
+       uint32_t ar0_enc; // first encrypted reader response
+       uint32_t nr1_enc; // second encrypted reader challenge
+       uint32_t ar1_enc; // second encrypted reader response
+ */
+       uint8_t found=0;
+       //uint32_t ks2;     // keystream used to encrypt reader response
+
+       // Generate lfsr succesors of the tag challenge
+       prng_successor(nt, 64);
+       prng_successor(nt, 96);
+
+       // Extract the keystream from the messages
+       //ks2 = ar0_enc ^ prng_successor(nt, 64);
+
+       s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+
+       for(t = s; t->odd | t->even; ++t) {
+               lfsr_rollback_word(t, 0, 0);
+               lfsr_rollback_word(t, nr0_enc, 1);
+               lfsr_rollback_word(t, uid ^ nt, 0);
+               crypto1_get_lfsr(t, &key);
+               crypto1_word(t, uid ^ nt, 0);
+               crypto1_word(t, nr1_enc, 1);
+               if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
+                       //printf("\nFound Key: [%012"llx"]\n\n",key);
+                       found = 1;
+                       break;
+               }
+       }
+       free(s);
+
+       if (found) return key;
+       return 0;
+}